Brand UNITAS Caliber 6316 Size 13 Function Version Hands 0,90x1,50 Stem 8030 Stem (subs.) 8050 Stem (2 pce) Balance staff 31507/31316 Balance staff (subs.) 31313/31317 Mainspring (subs.) 1,70x11,5x0,13 Mainspring (subs.) 04969 Battery